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Nb. 741,394. PATBNTED OCT. 13, 1903.

vJ. BYSTROM.

WRENCH.

APPLICATION FILED DBO. 3.1902.

R0 MODEL.

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Patented October 13, 1903.

PATENT @Trrnn.

JOHN BYSTROM, OF CHICAGO, ILLINOIS.

WRENCH.

PECIFICATION forming part of Letters Patent No. 741,394, dated October 13, 1903.

7 Application filed December 3. 1902. Serial No. 133,705. (No model.)

To aZZ whom it may concern:

Be it known that I, J OHN BYSTROM, a citizen of the United States, residing at Chicago,

in the county of Cool: and State of Illinois, have invented certain new and useful Improvements in Wrenches, .of which the following is a specification.

This invention pertains to wrenches for grasping pipes, rods, or nuts, and has for its object the production of awrench simple and strong in construction, powerful in action, having a considerable range of application, readily adjustable to objects of different sizes, and easily removable therefrom.

In the accompanying drawings, Figure 1 is a side elevation of a wrench embodying the features of my invention. Fig. 2 is a longi tudinal section taken on the plane of Fig. 1, but showing the jaws nearly closed. Fig. 3 is a view illustrating the application of my invention to an alligator wrench.

In the construction of a wrench embodying this invention 1 provide a body portion A, recessed transversely to form the ears A, between which the outer jaw of the wrench is pivoted, and the ears A between which the handle of the wrench is pivoted. The cars A and A are suitably perforated to receive pivot-pins, to be hereinafter described. The inner face of the body portion A is serrated, forming the inner jaw A of the wrench. The outer jaw B is pivotally mounted upon a rivet B, extending through the coinciding openings in the ears A of the body portion. The forward end of this jaw is formed to grasp a pipe, rod, or nut, while its rear end B is curved inwardly toward the body portion A. A handle 0 is pivotally mounted upon a rivet 0 between the ears A of the body portion A. The inner end of this handie is provided on its rear side with a projection 0 adapted to bear against the curved rear end B of the jaw B. When the wrench is placed upon a pipe or rod, a movement of the handle in the direction'of the arrow, Fig. 1, moves the jaws together, firmly grasping the pipe between the outer jaw and the serrated inner jaw. Continued pressure upon the handle causes the jaws to be pressed more firmly together by reason of the cam action of the projection O at the rear side of the handle bearing against the inner side of the curved rear end B of the jaw B. To release the grip of the wrench, it is only necessary to push the handle in the opposite direction, whereupon the jaws open and the wrench. may be withdrawn.

Referring to Fig. 3, a is the body portion,

recessed transversely to form the ears a and a for receiving the outer jaw and the handle, respectively. The inner side of the body portion is serrated to form the inner jaw a of the wrench. The outer jaw 11 of the wrench is pivotally mounted upon a rivet 19 between the ears a of the body portion a, the rear end 6 of said outer jaw extending at an angle with the forward end thereof. The handle 0 is pivotally connected with the body portion a by means of a rivet c, passing between theIears a of said body portion. The handle 0 is provided with a projection 0 adapted to bear against the rearward projection b of the outer jaw b. The action of this modified form of wrench is the same as that of the form shown in Figs. 1 and 2.

It is clear that the inner jaw mightbe formed separate from the body portion and pivotally connected therewith or with the outer jaw, also that the jaw so pivoted might be moved by a cam conformation of the inner end of the handle; but I consider that the construction herein shown is preferable on account of its greater simplicity and strength, the results obtained being substantially the same in both cases. It is also apparent that other slight changes might be made in the embodiment herein shown of this invention without departing from the spirit and scope of my invention. I therefore do not desire to limit myself to the specific construction herein illustrated and described.

I claim as my invention 1. In a wrench, in combination, an outer jaw substantially in arc form; a body portion located on the concave side of said outer jaw and pivotally connected with said outer jaw near the middle of its curved portion; an inner jaw fixed with relation to said body portion and a handle pivotally connected with said body portion and adapted to engage the outer jaw on its inner concave edge and rearward of its pivotal connection with said body portion.

2. In ajwrench, in combination, an outer 

